package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @author : Yoo19
 * @description :
 * @createDate : 2025/7/15 9:07 07
 */
@Configuration
@Order(1)
public class MyGlobFilter implements GlobalFilter {
    @Autowired
    private StringRedisTemplate redisTemplate;
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径为：" + url);



        //白名单
        if(url.contains("/login")){
            System.out.println("白名单：" + url);
            return chain.filter(exchange);
        }
        if(url.contains("/sendCode")){
            System.out.println("白名单：" + url);
            return chain.filter(exchange);
        }
        if(url.contains("/register")){
            System.out.println("白名单：" + url);
            return chain.filter(exchange);
        }

        //校验token
        String token = request.getHeaders().getFirst("token");
        if(token == null){
            System.out.println("token为空：" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //从redis获取token
        Claims claims = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = claims.get("userId", Integer.class);
        String key = "token-" + userId;
        String redisToken = redisTemplate.opsForValue().get(key);
        //判断
        if(redisToken == null){
            System.out.println("token已过期：" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        if(!token.equals(redisToken)){
            System.out.println("token错误：" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }


        //续期token
        redisTemplate.expire(key,30, TimeUnit.MINUTES);


        //放行
        System.out.println("放行：" + url);
        return chain.filter(exchange);
    }
}
